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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a87ee3012e3ada85a598b474d38ded1bacf7b53bcdb36bd918fd60e54b03d5' 
  AND token = 'DeChhU9aAIHVKaRLy3kqg5QotQshuZUNUC+gYZix+RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}